Ultrasound imaging device, ultrasound imaging system, ultrasound imaging method and ultrasound imaging program

1. An ultrasound imaging device, comprising:

processing circuitry configured

to receive ultrasound waves transmitted from a surface of an analyte towards an inside of the analyte and reflected therein, and generate an ultrasound image of the inside of the analyte;

to direct a portion of the analyte included in the ultrasound image in a predetermined direction by adjusting a rotation angle of the ultrasound image based on a line symmetrical region in the ultrasound image, where the line symmetrical region has a shape of line symmetry with respect to a digital line that is a central axis;

to set a reference point in the rotation angle adjusted ultrasound image by matching a template image of the ultrasound image including the reference point while superimposing the template image on the ultrasound image, wherein, the reference point is included in a linea alba existing between a pair of right and left rectus abdominis muscles of an abdomen;

to search first and second pathways between the reference point as a search start point and a line crossing from a front side to a rear side of the rectus abdominis muscle by a Dijkstra method, such that the first pathway is from the search start point to an end point at the front side and the second pathway is from the search start point to an end point at the rear side;

to impart one or more muscle seed points to a muscle region between the first and second searched pathways as a muscle; and

to demarcate a seed region to which a seed point belongs, and divide an image region of the analyte included in the ultrasound image into a plurality of regions according to a type of tissue.

2. The ultrasound imaging device of claim 1 , wherein:

the processing circuitry imparts the seed point at a predetermined position relative to the reference point.

3. The ultrasound imaging device of claim 2 , wherein:

the ultrasound image is an ultrasound stitched image of a cross section of the analyte, obtained by stitching a plurality of ultrasound images generated based on ultrasound waves transmitted from a plurality of mutually different positions on the surface of the analyte towards the inside of the analyte and reflected therein.

4. The ultrasound imaging device of claim 1 , wherein:

the ultrasound image is an ultrasound stitched image of a cross section of the analyte, obtained by stitching a plurality of ultrasound images generated based on ultrasound waves transmitted from a plurality of mutually different positions on the surface of the analyte towards the inside of the analyte and reflected therein.

5. The ultrasound imaging device of claim 4 , wherein the processing circuitry is further configured

to select at least one ultrasound image from the plurality of ultrasound images for generating an ultrasound stitched image, and impart a skin seed point corresponding to the skin at a position on the ultrasound stitched image corresponding to a position on an upper end of the selected at least one ultrasound image.

6. The ultrasound imaging device of claim 5 , wherein:

the processing circuitry imparts an other seed point to a position on the ultrasound stitched image corresponding to a position on a lower end of the selected at least one ultrasound image in association with the tissue other than skin and muscle.

7. The ultrasound imaging device of claim 1 , wherein:

the processing circuitry directs a navel portion of the analyte included in the ultrasound image in the predetermined direction by adjusting a direction of the ultrasound image based on the line symmetrical regions in the ultrasound image.

8. The ultrasound imaging device of claim 7 , wherein:

the processing circuitry sets, as the reference point, a position a luminance value equal to or higher than a predetermined threshold value, on a transmission direction line extending in the transmission direction of the ultrasound wave through the navel portion.

9. The ultrasound imaging device of claim 8 , wherein:

the processing circuitry sets a position with the largest luminance value as the reference point on the line extending in the transmission direction of the ultrasound wave through the navel portion.

10. An ultrasound imaging method, comprising:

receiving ultrasound waves transmitted from a surface of an analyte towards an inside of the analyte and reflected therein, and generating an ultrasound image of the inside of the analyte;

directing a portion of the analyte included in the ultrasound image in a predetermined direction by adjusting a rotation angle of the ultrasound image based on a line symmetrical region in the ultrasound image, where the line symmetrical region has a shape of line symmetry with respect to a digital line that is a central axis;

setting a reference point in the rotation angle adjusted ultrasound image by matching a template image of the ultrasound image including the reference point while superimposing the template image on the ultrasound image, wherein, the reference point is included in a linea alba existing between a pair of right and left rectus abdominis muscles of an abdomen;

searching first and second pathways between the reference point as a search start point and a line crossing from a front side to a rear side of the rectus abdominis muscle by a Dijkstra method, such that the first pathway is from the search start point to an end point at the front side and the second pathway is from the search start point to an end point at the rear side;

imparting one or more muscle seed points to a muscle region between the first and second searched pathways as a muscle; and

demarcating a seed region to which a seed point belongs, and dividing an image region of the analyte included in the ultrasound image into a plurality of regions according to a type of tissue.

11. A non-transitory computer-readable recording medium storing a program causing a processor of an ultrasound imaging apparatus to execute processing, the processor configured to control operation of the ultrasound imaging apparatus, the processing comprising:

receiving ultrasound waves transmitted from a surface of an analyte towards an inside of the analyte and reflected therein, and generating an ultrasound image of the inside of the analyte;

directing a portion of the analyte included in the ultrasound image in a predetermined direction by adjusting a rotation angle of the ultrasound image based on a line symmetrical region in the ultrasound image, where the line symmetrical region has a shape of line symmetry with respect to a digital line that is a central axis;

setting a reference point in the rotation angle adjusted ultrasound image by matching a template image of the ultrasound image including the reference point while superimposing the template image on the ultrasound image, wherein, the reference point is included in a linea alba existing between a pair of right and left rectus abdominis muscles of an abdomen;

searching first and second pathways between the reference point as a search start point and a line crossing from a front side to a rear side of the rectus abdominis muscle by a Dijkstra method, such that the first pathway is from the search start point to an end point at the front side and the second pathway is from the search start point to an end point at the rear side;

imparting one or more muscle seed points to a muscle region between the first and second searched pathways as a muscle; and

demarcating a seed region to which a seed point belongs, and dividing an image region of the analyte included in the ultrasound image into a plurality of regions according to a type of tissue.